Yes, there will be further goings on involving those regions, though for full disclosure I plan to keep a couple of regions of Aururia as bonus content for the book version - these are parts which didn't get much coverage in the main timeline. (The Blessed Land is one of those, as people who have read Book 2 will already recognise).
Strictly speaking, it's been confirmed that there's something called the Aururian Industrial Revolution. It hasn't been said directly whether it's Tjibarr or elsewhere (or a combination of regions, for that matter).
Book 4 will cover some parts of early industrialisation, though it's planned to end with the Nine Years' War, which is only a few decades after the end of Book 3. (I already know the closing words of the main narrative of Book 4).
As said, there will be some further details - they won't be a complete mystery. But I can't go in depth on everything across the LoRaG world - the scope is simply too vast. I mean, I have enough ideas jotted down to write another half-dozen books just on the pre-Houtmanian era in Aururia if I wanted to. Most of those will remain ideas, but some of them may get turned into short stories somewhere along the line (such as the recent one which appeared in the If We'd Just Got That Penalty anthology of alternate sports stories from Sea Lion Press).
